Method of and machine for making blanks



Jan. 14, 1947. c. D. KNOWLLTON ETAL' 2,414,109

METHOD OF AND MACHINE FOR- MAKING BLAN KS Original Filed March 26, 1942s She ets-Sheet 1 J 14, 1947' c. D. KNOWLTON ET AL 2,414,109

METHOD OF AND MACHINE FOR MAKING BLANKS Original Filed March 26, 1942 "sSheets-Sheet 2 Gear 'eEGDc/r'ke 5 y C. D. KNOWLTON ETAL 2,414,109

METHOD OF AND MACHINE FOR MAKING BLQNKS Original Filed March 26, 1942 3Sheets-Sheet 5 Patented Jan. 14, 1947 METHOD OF AND MACHINE FOR MATKIN GBLANKS Cutler I). Knowlton, Burke, Fairhaven,

Rockport, and George F. 0. Mass, assignors to Hoague- SpragneCorporation, Lynn, Mass, a corporation of Massachusetts Originalapplication March 26, 1942,

436,362. Divided her 4, 1943, Serial 13 Claims. 1

Thi application relates to the manufacture of box blanks such, forexample, as that illustrated in United States Letters Patent No.1,811,135, granted June 23, 1931, on an application filed in the name ofC. D. Knowlton. The present application is a division of an applicationfor Letters Patent of the United States, Serial No. 436,362, filed March26, 1942, in our names.

In the manufacture of box blanks as disclosed in the aforementionedapplication, webs of shell, cover and lining material are continuouslycombined to form a Web of blank material from the end of which discreteblanks are severed and fed step by step past a plurality of formingstations at each of which an operation is performed toward thecompletion of a box blank. ent application is concerned with thatstation at which slots are formed in theblank to separate the end-wingsand the corner-laps and the outer edges of the end-wings are cut awaytoaccommodate the thickness of the material where the end-wing extensionsare folded over the corher-laps during the setting up of the blank tobox form.

An object of the present invention relates to the provision of animproved mechanism for performing the above operations. four sets ofknives are provided for forming the slots-and the cutawa portions at theouter edges of the end-wings in a single operation. To accommodateblanks of various sizes, provision is made for adjusting the knivesrelatively to one another. As illustrated herein, the sets of knives arearranged in pairs, each pair being adjustable as a unit toward and awayfrom the other pair, and the sets of each pair are adjustablesimultaneously toward and away from each other. Provision is also madefor adjusting the knives of each set toward and away from each other.

Another object of the invention relates to the provision of improvedmeans for forming the slots between the end-wings and corner-laps in amanner to providea finished appearance for the edges of the end-wingswhich are visible in the completed box, and to the method by which thisis accomplished. In the attainment of this object the edges of theend-wings along the slots separating them from the corner-laps are sotreated that the cover paper extends over the edges. This is effected inthe illustrated embodi- To this end,

ment of the invention by turning the marginal portions of the end-wingsinwardly when the blank is severed to form theinner edges of thecorner-laps, after which the inwardly projecting portions are-severedin-substantially the plane of Serial No.

and this application Decem- No. 512,856

the inner face of the blank to form the edges of the end-wings with thecover paper extending thereover to the inner face of the blank. It willof course be obvious that this method of forming the slots is applicablein those cases in which the blank is not provided with cover paper. Whensuch a blank is treated, the outer surface of the blank will extend overthe edge, .thus eliminating the raw edge that would be formed 'bytheconventional slotting methods.

The above and other features of the invention, including various noveldetails of construction andcombinations of parts, will now'bemoreparticularly described with reference to the accompanying drawings,and pointed out in the claims.

In the drawings, V

Fig. 1=-is an end elevation, partly in section,;of one form oiapparatusby which the presentinvention may be carried out;

"Fig. 2 'isa section on the line Ila-II of Fig. ;l, on .alarger .scalethan Fig. 1;

"Fig.3 is an exploded view of .oneof the mechanisms for forming theslotbetween a cornerelap and an end-wing;

:"Fig. 4 is a .view,partl-y in section, of .oneof the sets of workengaging members;

Fig. v5 is .a plan View of .a blank as it appears after beingseveredfrom a compound web .of sheet material;

"Fig. :6 is a plan view ofthe blank'after it has been operated upon bythe present apparatus;

'Fig. "7 is a perspective view on a greatly en.- larged.scale'indicating how the cover paperhides the. edge of thelend-wwingwhenthe blank is operated upon-by the mechanism of Figs. 3 and 4; and

Fig. 8:is a perspective view of a portion pfa box illustrating the.appearance of the covered edgeoft-he end-wing in the completed box.

@ne form of blank upon which ,the machine illustrated hereinis.designedito operate .is shown at a in Fig. 5 and comprises a layerof.shel1=rnaterial b; a liner.c,.and a-layer of coverpaper 11. hec'overpaper-maybe folded around the edges of the blank ate to provide afinished appearance. 'Theiblank isoperated uponzbyithe present machineto form slots f which .separate the endwings :g from thecOrner-laps "Theouter. edges 'of the corner-laps are also cutiaway at? to .accommodate.the thickness of the material where the end-wing extensions are foldedover the corner laps during-the setting up of the='blanl s-to box form.Side-wing k extend-between b11960!- ner-laps After the blank is thusoperated upon, it passes successively through other stations asillustrated in the parent application re- 3 ferred to above to completethe formation of the box blank.

The machine is built on a frame which comprises supporting bars IE)extending lengthwise of the machine and supported on the floor.Extending upwardly from the bars Iii are posts I2 to the upper ends ofwhich are fastened rails I4 which extend lengthwise of the machine. Theposts I2 are connected by a cross bar It and the rails I4 areinterconnected by one or more cross bars (not shown) to provide a rigidframe work.

The blanks are fed through the folded edges 6 extending normal to thedirection of feed by a pair of endless belts it which engage oppositesides of the blank and which feed the blank into engagement with a pairof stops 29 mounted on shafts 22 for movement from the positionsillustrated in Fig. 1, downwardly into the path of movement of theblank. With the forward motion of the blank thus arrested the blank isoperated upon as will be described, after which the'stops are returnedto the positions illustrated and the blank resumes its forward movementthrough the machine. In order to accommodate blanks of dierent sizes thestops 2c are carried by slides 24 which are mounted for lateralmovements on a rack 26 extending crosswise of the machine. This rack issecured to the upper ends of posts 28, the lower ends of which aresecured to the rails I4. Pinions 30 carried by shafts 32 supported inthe slides 24 engage teeth in the upper surface of the rack 'bar 26 toeffect lateral movement of the slides 24 and the stops 2!! carriedthereby upon turning the shafts 32.

Prior to operating on the blank after it has come to rest against thestops 20, the blank is properly centralized in the machine by a pair ofjoggers 34 having ends provided with notches for engagement with theopposite edges of the blanks. The joggers are adjustably mounted in theupper ends of arms 36, the lower ends of which-are secured to slides 38movable transversely of the machine on slideways 40 formed along theupper sides of cross bars 42 suspended by hangers 44 from the rails I4.The slides 38 are provided wth rack bars 46 engageable with pinions 48which are operated at a predetermined time to move the joggers towardeach other to centralize the blank and then to retract the joggers whilethe blank is being operated upon. The pinions 48 are operated by a gear50 mounted on a shaft 52 and connected by an arm 54, a link 56, a lever58, and a cam roll (not shown) to a cam 60 mounted on a continuouslyrotating drive shaft 62 whereupon the gear 50 is oscillated to operatethe joggers. Provision is made for adjusting the paths of movement ofthe joggers thereby to accommodate blanks of different sizes. For a morecomplete description of the mechanisms thus far described, attention isdirected to the parent application.

The machine is provided with four sets of cutters, one set operating ateach corner of the blank to form the slots separating the end-wings andthe corner-laps and to cut away the corner-laps at 7'. The knives bywhich the slots and recesses are formed in the upper left-hand corner ofthe blank shown in Fig. 6 are illustrated in Fig. 4. The recess 7 in theblank is formed by a knife 64 movable downwardly past a cooperatingshear block 66 to the position illustrated. A second knife 68 movesdownwardly with the knife 64 and cooperates with a shear block ID to cutthe blank along the line s (Fig. '7). The portion of the endwingadjacent to this cut is turned down at t the machine with sleeves.

around the edge of a knife I2 by the curved rear portion I4 of the knife68. The knife I2 is spaced sufficiently from the knife 68 at this timeso that there is no cutting action between these knives. After the knife68 has moved downwardly to the position illustrated, the knife I2 movesin a substantially horizontal plane to trim off the downwardlyprojecting portion of the blank in the plane of the inner face of theblank, thus giving the appearance shown in Fig. '7. It will be notedthat the cover paper 01 provides the end-wing g with a finished edgealong the slot 1. Thus, when the box is assembled, this finished edge twill appear as indicated in Fig. 8 so that the edge of the layer ofshell material is not visible in the completed box.

The mechanisms for operating on the blank at this station are mounted ona pair of carriages I6 (Figs. 1 and 2) mounted on the rails I4 foradjustment lengthwise of the machine. For effecting this adjustmentracks I3 are secured to the underside of each carriage near the ends.These racks are engageable with gears mounted on shafts 82 which aresupported by bearings 84 secured to the undersides of the rails I4. Eachof the shafts 82 has on its outer end a member 86 (Fig. 1) arranged toreceive a crank whereby each shaft may be individually rotated to adjustits associated carriage lengthwise of the machine. The carriages arelocked in their adjusted positions by gibs 88 secured to the rails byscrews 90.

To each of the carriages is secured a pair of gibs 92 (Fig. 2) formingbetween them a slideway for a pair of slides 94 movable lengthwise of rthe carriages or transversely of the machine. The

slides on each carriage are mounted for similar adjustment toward andaway from each other by a screw 96 having right and left hand threadedportions passing through threaded sleeves 98 mounted in blocks I00 (Fig.2) secured to a side of each slide. These sleeves provide individualadjustment of the slides relatively to each other and are locked in thedesired positions of adjustment by set screws I32 engaging grooves inthe Carried by each of the slides 94 is a bed I04 upon each of which ismounted a pair of shear blocks 66 and I0 (Fig. 2). The inner portion ofeach bed is secured to its slide by a pair of screws I65 threaded into arod I08. These rods are journaled in spaced arms projecting from theinner portions of each slide as shown more clearly in Fig. 2. Each pairof screws I08 passes through a bar II!) which engages the upper rearwardsurface of a bed I84. The screws pass through recesses in the end of thebed as shown in Fig. 2 so that, upon loosening the screws slightly, thebar Ill) and the rod I08 may be swung as a unit to free the rearwardportion of the bed. Tongue and groove portions II2 between the slide andbed facilitate the proper positioning of the bed on its slide. Othersecuring means (not shown) may be provided between the outer portions ofthe slides and beds more firmly to secure them together.

Secured to the outer portions of the beds I94 and extending upwardlytherefrom are supporting frames I I4 having overhanging arm portions IIB(Fig. 1) for supporting the knives 64 and 68. The lower portions of thesupporting frames have dovetail grooves II8 with which ocooperate thewedge heads I20 of bolts I22 (Fig. 3) which pass through blocks I24 andreceive nuts I26 for rigidly securing theblocks to the frames H4 and theshear blocks 66 to the blocks I24. The blocks I24 may be adjusted alongthe beds by reason of the dovetail connection provided by the of thegibs (Fig. 2) is backed up by screws I I5 grooves H8 and the heads I20of the bolts and which permits adjustment of the gib toward the byreason also of the fact that the other ends th gib t t k up for w ar, Thlid are of the blocks I2 a e l da y secured to the bed connected tovertically movable cross-girts I80 y bolts I23 passing through the cksI24 a d which are connected at their oposite ends to nuts I36 receivedby a T-slot in the bed (Fig. 1). cross-heads I82 (Fig. 1) which are inturn se- Heads 34 of the bolts IZ'B (Fig. 3) hol each cured to the upperends of vertically movable shear block 66 against the upper surface ofits rods I84, These rods pass through bearings I86 upporting block I 24.The supporting block has secured to the side rails I 4 and throughbearings a l pin ur a e I36 r directing the scrap from I88 secured tothe supporting bars Iii. The rods the blocks. A Conveyor belt (notshown) may are reciprocated by the shafts 62 which carry be p d a thebottom of e machine o eccentrics I 9B connected by straps I92 and pivotcarrying material trimmed from the blocks away pins I94 to clamps I96secured to the rods. The from the machine. 011 the fron f h pp rknife-supporting slides are connected to the ing blocks I24 toward theentrance end of the cross-girts as follows. Threaded through the machinear adl s ab y secured guide plates upper portions of the slides aresleeves I98 pro- I 8 a a d o engagement y the forward viding in theirlower ends abutments for springs edges of the blanks to insure that theblanks will ze Th springs t a ainst flanges 292 near ri e sm ot ly v r hl k the u er ends of rods 204, to the bottoms of The shear blocks 10 arecarr ed y pp t n which are threaded nuts acting on the bottoms of framesI ls which are mounted on the beds I04 th bushings t prevent downwardmovement of for adjustment relatively to the shear blocks 6b thebushings on the rods. The uppe ends of the to vary the distance betweenthe slots f and the rods are provided with heads 2e! clamped be-ClltaWay portions 9' 0f the blank- The frames Mil tween bars 206 securedto the under sides of the a e j t y s e e t t ds by bolts cross-girtsand extending therebetween and gilbs I35 and 31 similar to the bolts I22and '28. ZQQgecuredCto the bars The bars 206 are se The kn ves 72 a s ppt in the frame M9 by cured to'the cross/girts for adjustment byclamproeka le members having Stud shafts M5 ing screws 2H] passingthrough bars 2I2 resting journaled in bearings 6 mo in arms on the uppersurfaces of the cross-girts. These f the Supporting frame Mt]. Theknives 72 are clamping screws are loosened to permit the slides normallymaintained in their retracted posi- 94 suppgltjng th ech ni ms foroperating on ti ns, sho n in by sp I59 ac the blanks to be adjustedtransversely of the tween arms I52 on the rockable members Hi2 andmachine T r it the lengthwise adjustment recesses I 54 in the frames 5.The positions of the parts with the carriages I6, the gibs 208 to wh chthemembe s I a e moved by t e may be loosened so that the upper ends ofthe sp s are hmited by e screws I55 actlng rods'zllc may sliderelatively to the cross bars against stops I 58 secured to the undersides of Auxiliary clamping screws 299 (Fig. 2) one of the arms I48 ofthe frames it. Ro s I59 threaded through the arms II6 are provided forare journaled on pins I62 in the arms I 38 and clampingthe Slides 5against downward moveare e a d y t e bac Sides of Wedges as 4.0 ment inthe frames II 4 whenever desired. This t se o e d n a y ahd pp theWedges may be done whenever the gibs 208 are loosened a ainst lateralthrust. Th se We act on to permit this lengthwise adjustment of theparts.

goils k561i clazal ried bsy theflarniis I52 tic2 otsciilate itlhe thusreliezving the gibs of the weight of the slides. m e Carr h e lllves 0T1111 8 Springs I (Fig. 2) act on the heads of the downwardly extendingpor o s t of e blank .15 screws to prevent their accidental turning.When (Flg- 4) alter the Operatlon 0f the khlves 54 the cross-girts aremoved downwardly during the and 63 n operation of the machine, they actthrough the mgxgeal l ggs s m a ggbg i a ge a r l li h y springs 2053 tomove the knives and strippers l S e e ah e nlves downwardly to aposition limited by the engageare mounted for adjustment relatively toeach ment of t 1ewer d of top crews 2 with ilther DQ lill ij lhg p a 1Wlt d g stops M6 in the upper surfaces of the supporting oWer e ds 0 e s1 e PP 6 e5 0 frames I I4. Upon further downward movement th s pp g pltes aredovetailed as shown of the cross-girts the springs 200 willcompress, 1n F1e- 1. Ea h of he knives, as sh w In ethus permitting thewedges I64 to move further gloilgiigtggfgggfiglfig firigmtiaeclfiegrgggownwairggytgs will he1 dlescritbred, totta ctuate the S nives us compemg e s 0 ing operaof which are elongated to underlie the projecting nears 0:11I til; kniiges. faggo lt lql mi liz fig The wedges I?! are2aijusltably clamped to the upwar .y roug a a in .e er vlower ends ofsides w ich are in urn seing an i cl n surface arranged to engage thecured for vertical adjustments by bolt-and-slot dovetailed portion ofthe plate I'm, whereby the Connections 229 (F 2) ma 222 dependingpposite ends of the knives may be m e in from brackets 224. Thesebrackets are connected the desired positions on the plates. Similarly tothe c 'os -gjrts ag between bars 225 and supported by the plates I'iilare strippers I'EEi, the gibs 2g3 Clamping screws 230 (Fig 1 passingwork engaging portions of which may be formed through bars 223 on tupper urf e of the Sponge rubber arranged to Clamp the blank on ocross-girts adjustably secure the bars 226 to the the t p surfaces ofthe Shea! blocks 79 1119011 under sides of the cross-girts. Accurateadjustdownward movement of the knives The pment of the verticalpositions of the Wedge carrypers normally extend downwardly below theing slides may be effected by screws 232 threadknives and hold theblanks in position during 70 ed into the brackets 224 and engaging thetops the return upward movement of the knives until of the slides 2I8.Springs 234 act between the they have cleared the blanks. slides andpins projecting from the arms 222 The slides I68 are mounted forverticalm0veto maintain contact of the slides with the heads mentbetween gibs I78 secured to the overhangof the adjusting screws when theslides are ading arms H6 of the supporting frames II4. One J'usted.

From the above it will be seen that the knives are arranged in foursets, one for operating upon each corner of the blank, the sets ofknives being in turn arranged in pairs, one pair operating on theleading portion of the blank and the other pair operating on thetrailing portion. The pairs of sets are adjusted toward and away fromeach other by rotation of the shafts 82 which act through the pinions 80and the racks 18 to move the carriages I6 along the supporting rails M.In order to permit this adjustment the gibs 88, by which the carriagesare locked to the rails, are first loosened and the gibs 208 and 228associated with the supporting bars 206 and 226, respectively, are alsoloosened. By means of this adjustment blanks for forming boxes. ofdifferent widths may be operated upon by the machine. The sets of knivesof each pair are also adjustable toward and away from each other toaccommodate blanks of different lengths by loosening the screws 2H) and230 and rotating the adjusting screws 66. This moves the slides atlengthwise of the carriages 92, these slides supporting the beds I04 andthe upwardly extending knife supporting arms H4. After the properadjustment has been effected, the screws Ziil and 23% are tightened tolock the sets of knives in their adjusted positions. For adjusting theknives of each set relatively to each other the bolts M2 by which theknives are clamped to the supporting plates I!!! are loosened, thuspermitting the knives to be moved along the plate into the desiredpositions of adjustment.

In the operation of the machine, the blanks are fed by the belts l8 intoengagement with the stops 2!! into position to be operated uponsimultaneously by the four sets of knives. After the blank comes to restagainst the stops, the vertical rods use are moved downwardly, whereuponthe cross-girts I83 carried thereby move the slides S88 and 2 l3carrying the knives and the wedges, respectively, downwardly toward theblank. The knives 6d and move into the positions shown in Fig. 4, theknives 64 forming the cutaway portions 3? in the outer edges of thecorner-laps and the knives 68 forming the slits s as illustrated in Fig.'7. At the same time, the surfaces [4 of the knives 58 turn the marginst of the end-wings g downwardly around the edges of the knives 12. Thisaction of the knives on fore the cross-girts I80 have completed theirdownward movement but further movement of the knives is prevented byengagement of the stop screws 2. i i with the stops 2 l 6. Furtherdownward movement of the cross-girts is permitted by compression of thesprings 290 associated with the knife slides and the wedges I64 continuetheir downward movement acting through the rolls N56 to operate theknives 12. These knives cooperate with the surfaces M of the knives 68to trim the downwardly projecting portions t of the blank in the planeof its lower surface, thereby to form the edges of the end-wings asshown in Fig. '7.

Having thus described our invention, what we claim as new and desire tosecure by Letters Patent of the United States is:

1. In a machine for making a box blank having end-wings, side-wings andcorner-laps, oppositely disposed sets of knives for operating onopposite sides of the \blank, each set comprising a knife for trimmingthe outer edge of a cornerlap and a knife for forming a slot between thecorner-lap and the adjacent end-wing, a single adjusting means formoving said sets of knives simultaneously toward and away from eachother,

the blank occurs be- 8 a single adjusting means for moving said sets ofknives as a unit in a direction normal to said first direction ofmovement, and means mounting the knives of each set for adjustmentrelatively to each other.

2. In a machine for making a box blank having end-wings, side-wings andcorner-laps, means for operating on each corner of the blank, saidoperating means being arranged in pairs, each of said operating meansincluding means for trimming the outer edge of a corner-lap and meansfor forming a slot between the corner-lap and the adjacent end-wing,single adjusting means for each pair of operating means for moving themsimultaneously toward or away from each other, single adjusting meansfor each pair of operating means for moving the pair as a unit toward oraway from the other pair of operating means, and means mounting thetrimming means of each or the operating means for adjustment relativelyto each other.

3. In a machine for operating upon a box blank, means for forming a slotin the blank comprising means for severing the blank along a line andbending an edge of the severed portion inwardly, and means engageablewith opposite sides of the inwardly projecting portion of the blank forsevering said portion in substantially the plane of the inner face ofthe blank.

4. In a machine for operating upon abox blank, means for forming a slotin the blank comprising means for severing the blank upon a line andbending an edge of the severed portion inwardly, and means includingsaid first-named means for severing the inwardly projecting portion ofthe blank in substantially the plane of the inner face of the blank.

5. In a machine for operating upon a box blank, a shearing member forforming a cut in the blank, said member having a work-engaging facearranged to bend the blank inwardly along the line of cut, and meanscooperating with a side of said shearing member for severing theinwardly projecting portion of the blank in substantially the plane ofthe inner face of the blank.

6. In a machine for operating upon a box blank, a shearing member forforming a cut. in the blank, said member having a work-engaging facearranged to bend the blank inwardly along the line of cut, and meansoperated in response to movement of said shearing member for severingthe inwardly projecting portion of the blank zbtgainst the adjacent sideof said shearing mem- I. In a machine for making a blank havingend-wings, side-wings and corner-laps projecting from the side-wings,said blank including a sheet of shell material to the outer face ofwhich has been applied a sheet of cover material, a vertically movablemember for severing the inner edge of the corner-lap and bending theadjacent edge of the end-wing inwardly, a member movable in asubstantially horizontal plane for severing the inwardly projectingportion of the end-wing, and means for sequentially operating saidmembers.

8. In a machine for making a blank having end-wings, side-wings andcorner-laps projecting from the side-wings, said blank including a sheetof shell material to the outer face of which has been applied a sheet ofcover material, a vertically movable member for severing the inner edgeof the corner-lap and bending the adjacent edge of the end-winginwardly, another member movable in a substantially horizontal plane forsevering the inwardly projecting portion of the end wing, and meansmovable with said vertically movable member for operating said othermember after the edge of the end-wing has been bent inwardly.

9. In a machine for making a blank having end-wings, side-wings andcorner-laps projecting from the side-Wings, said blank including a sheetof shell material to the outer face of which has been applied a sheet ofcover material, a vertically movable member for severing the inner edgeof the corner-lap and bending the adjacent edge of the end-winginwardly, a member movable in a substantially horizontal plane forsevering the inwardly projecting portion of the endwing, means normallyholding said last-named member away from the path of movement of saidvertically movable member, a cam roll associated with said horizontallymovable member, and a cam movable with said vertically movable memberand cooperating with said cam roll for operating said horizontallymovable member after the edge of the end-wing has been bent inwardly.

10. In a machine for making a blank having end-wings, side-wings andcorner-laps projecting from the side-wings, said blank including a sheetof shell material to the outer face of which has been applied a sheet ofcover material, a pair of shearing members movable in a direction atright angles to each other, means for moving one shearing member tosever the inner edge of the corner-lap and to [bend the associated edgeof the end-Wing inwardly, and means formoving the other shearing memberto trim the projecting portion of the end-wing against the adjacent sideof the shearing member first moved.

11. Those steps in the method of making a blank having end-wings,side-wings and cornerlaps projecting from the side-wings, said blankincluding a sheet of shell mater'ialto the outer face of which has beenapplied a sheet of cover material, which comprises severing the inneredge" of the corner-lap and bending the adjacent edge of the end-winginwardly, and then severing the inwardly projecting portion of theend-Wing from one side in substantially the plane of the inner face ofthe blank while the other side of said portion is supported againstlateral movement.

12. In a machine for operating on a box blank, mechanism for forming aslot bounded along one side by a rounded edge comprisingv means forsevering the blank along a line to form the opposite edge of the slotand for bending the severed portion inwardly, and means'for severing theinwardly bent portion along a straight line in the plane of the innerface of the blank.

13. Those steps in the method offorming box blanks from a sheet oflaminated material composed of a sheet of shell material to the outerface of which has been applied a sheet of cover material which comprisesforming a cut in the (blank along a line to form oneeclge of a slotbetween an end-wing and a corner-lap, bending the material inwardly ofthe blank to form a rounded edge along the opposite side of the slot andsevering the inwardly projecting portion in the plane of the inner faceof the blank whereby the cover paper extends over the rounded edge alongthe opposite side of the slot.

CUTLER D. KNO-WLTON. GEORGE F. C. BURKE.

Certificate of Correction Patent No. 2,414,109. January 14, 1947.

' CUTLER D. KNOWLTON ET AL. I i

It is hereby certified that errors appear in the printed specificationof the above numbered patent requiring correction as follows: Column 3,line 25, for dierent read diflerent; column 4, line 70, for ocooperateread cooperate; column 5, line 19, for blacks read blocks; column 9,line 28, claim 10, for a direction read directions column 10, line 6,claim 11, for comprises read comprise; and that the said Letters Patentshould be read with these corrections therein that the same may conformto the record of the case in the Patent Office.

Signed and sealed this 7th day of October, A. D. 1947.

THOMAS F. MURPHY,

Assistant flommi'ssz'oner of Patents.

